@cor3zone
Actually, while I do edit my comments constantly, they're most grammar corrections, because I have a bit of an OCD regarding that. In the last comment, the only thing I added was that last sentence. My point, overall, is usually the same; moreover, I try to do the editing as soon as I can, and as people usually take a while to respond, it works out. I'm not used to talking with people like you, who respond almost immediately (which is a good thing! I appreciate it). I'll try, however, to refrain from editing my comments when continuing to speak with you, so I hope we can continue this discussion, because I'm having fun here, and as someone who aspires to be a writer, I'm also interested in your perspective and analysis of the protagonist's psyche.
Well, as before, I do see your points. And yeah, you're right. I remembered it wrong. What he enjoys is, indeed, the adrenaline. Nevertheless, that doesn't change the fact that he has never actually felt any guilt or remorse by what he was doing, so while he hasn't shown murderous traits, he has shown himself to be a bit of a psychopath, potentially annulling your theory that subconsciously did it to lessen his guilt. As for vindictive traits, well, there has never been an opportunity for this trait, or the lack thereof, to manifest itself before this, so the lack of evidence goes both ways.
As far as we readers are concerned, he's an empty slate regarding this, and he could go either way.
This point also means he's not vindictive
I'm sorry, but I don't see how what you previously stated in any way implies that. What you clarified is that he does it for the thrill of fighting, which I agree with, but it doesn't mean he can't be vindictive. It just means he's not murderous, and people who are not murderous can be vindictive. If the comment about him taking a troll's comment was meant to be the justification for that, I disagree. That just means he's crazy, as far as I can tell.
As for directly bringing him harm, again, you're right. That didn't happen. I'll readily admit it when I'm wrong.
About your last point: he went into the dungeon to save innocent people. Yes, an idiotic attempt, but he has a hero complex, so trying to save innocent people while sacrificing himself is understandable. On the other hand, putting his life on the line for scum? Well, I think that's forcing it a bit.
Also, rest easy; even if I find grammar mistakes, I won't edit this comment.